OS2-5相分離合金を用いた熱エネルギー貯蔵材料開発に向けた熱物性測定
Measurement of Thermophysical Properties forDeveloping Thermal Storage Materials Using Miscibility
Gap Alloys
小畠秀和 1, 菅原陸 2, 清宮優作 2, 小澤俊平 2, 杉岡健一 3, 白鳥英 4, 正木匡彦 5, 下西里奈 6, 小山千尋 6,
石川毅彦 6
Hidekazu KOBATAKE1*, Riku SUGAHARA, Yusaku SEIMIYA 2, Shumpei OZAWA2, Ken-ichi
SUGIOKA3, Suguru SHIRATORI4, Tadahiko MASAKI5, Rina SHIMONISHI6, Chihiro KOYAMA6,Takehio ISHIKAWA6
同志社大学，Doshisha University,
千葉工業大学，Chiba Institute of Technology,
3 富山県立大学，Toyama Prefectural University
4
東京都市大学，Tokyo City University
5 芝浦工業大学, Sibaura Institute of Technology
6 宇宙航空研究開発機構，JAXA
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1. Introduction
Thermal energy storage is an essential technology for stabilizing the fluctuating electricity supplies generated
from renewable energy sources¹. Phase Change Materials (PCMs), which store energy through latent heat,hold great promise for the development of reliable thermal energy storage systems because of their stable
operation temperature². Metallic PCMs are particularly suitable candidates due to their high energy density
at melting temperature and high thermal conductivity to achieve high energy exchange efficiency³. Although
operating at higher temperatures is desirable to enhance system efficiency, chemical reactions of the PCMs
with contact materials arises as crucial problem at elevated temperature. To address this challenge, Miscibility
Gap Alloys (MGAs) are expected to prevent chemical reactions by encapsulating the low-melting-point phasewith a phase that is stable at high temperatures⁴.
To design the microstructure and evaluate the capacity of Miscibility Gap Alloys as thermal storage materials,
understanding the thermophysical properties of the alloys in the molten state is indispensable. We haveembarked on a project aimed at measuring the thermophysical properties of liquid alloys in miscibility gap
systems utilizing the International Space Station (ISS). The thermophysical properties, such as density, surface
tension, and viscosity, were measured using the Electrostatic Levitation Furnace (ELF), which has been
installed in the Kibo module of the ISS. The obtained thermophysical properties were evaluated based on
1 of 2uncertainty analysis and compared with the data measured under gravity. Using these thermophysicalproperties, the heat and mass transport phenomena were evaluated through numerical simulations. The latest
progress of the project will be presented.
Acknowledgement
This research was financially supported by JSPS KAKENHI under Grand No. 24K01229.

Oneoftheauthors (SO) gratefully acknowledges the financial support provided by the JSPS KAKENHI under Grant No.
P20H02453, as well as a research grant from the Japan Institute of Copper.
References
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IRENA, Innovation outlook: Therml Energy Storage, International Renewable Energy Agency (2020).
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A. Rawson, E. Kisi, H. Sugo and T. Fiedler: Int. J. Heat. Mas. Trans., 77 (2014) 395.
Odenthal, F. Klasing and T. Bauer: Energ. Proc., 135 (2017) 14.

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